SPARK PLUG

摘要

A spark plug having a discharge section composed of a noble metal chip. The spark consumption, oxidation consumption, and abnormal consumption of the discharge section are suppressed, and separation of the noble metal chip from the surface of the discharge section is prevented. The spark plug comprising a center electrode (3) and a ground electrode (4) the side surface of which faces the end portion of the center electrode (3) is characterized in that at least a center electrode noble metal chip (31') or a ground electrode noble metal chip (32') is so welded to the corresponding electrode of the center electrode (3) or the ground electrode (4) as to face a spark discharge gap (g), a center electrode discharge section (31) having a center electrode discharge surface (31t) or a ground electrode discharge section (32) having a ground electrode discharge surface (32t) are formed by the welding, and each of the center electrode noble metal chip (31') and the ground electrode noble metal chip (32') contains Ir as the main component, Rh, Ni, and at least one of Pt and Pd.